Jump Animation questiom

Hi, I've imported my jumping and falling animations from Blender after I imported the character model and idle animation. I've imported a walk and run animation from the asset store that work just fine, but here is the problem: When I jump and/or fall, the center of my character controller seems to move halfway up the character! This means that when I jump, I appear lower than I should and when I hit the ground, the lower half of the character goes through the floor, then rises back up as it assumes the idle animation! How do I change the location of the center of the collider for a single animation? Am I doing something wrong?